Characterization of gold-bearing tailings by diagnostic leaching for reprocessing by flotation and leaching [Caracterización de relave aurífero mediante lixiviación diagnóstica para reproceso mediante flotación y lixiviación]
The purpose of the present investigation is the evaluation to reprocess the Sayapullo tailings, to extract the gold and silver that it still has, for which an initial chemical analysis, granulometric analysis and mineral flotation tests for gold and silver were made, then The percentage of gold extraction was performed by diagnosis of oxidative leaching (DLT).
The DLT consists of the quantification of the percentage of gold extraction by cyanidation as the oxidation state of the mineral increases. For this, progressive chemical attacks were carried out with oxidizing agents for each stage in the following order: Sodium Carbonate (Na2CO3), Hydrochloric Acid (HCl), Sulfuric Acid (H2SO4) and Nitric Acid (HNO3). The gold content in the solutions was determined by ICP-OES and in the solids by fire assay.
It is concluded that the Sayapullo tailings have 44.68% free gold, 3.47% gold associated with sulfates, 11.64% gold associated with carbonates, 6.13% gold associated with Cu-Zn sulfides, 31.49% associated with pyrites and arsenopyrites; and 2.60% gold associated with silicates.
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